First off I like extreme training! So for me having pepper spray in the face would be another way to pressure test what I do. I have been pepper sprayed a number of times while going through training to be able to carry it work related as well as having been maced and cannistered (the worst) going through the police academy. The more you have it done the less it effects you!
(at least in my case and everyone else I know)
If a student wanted to feel the effects of pepper spray to know that they can still function after being sprayed
I think that is a good thing. However, having children do it as part of a test is well probably not very prudent and could be very dangerous!
It I think is irresponsible! I would also question this instructor based on his training in this field? It would not be good if he had no training in this area! How does he account for people with health risks, asthma, etc.